FLEAS AND THEIR CONTROL
FLEAS
Fleas are parasites of most mammals and birds, particularly irritating
because of their frequent bites. The usual flea to infest dogs is the cat flea, Ctenocephaldes
felis, with the dog flea, Ctenocephaldes canis being less common.
They will quickly and easily jump from dog to man to cat or so forth, not being
particular from whence they feed. They prefer to live below 5000 feet elevation,
and thrive in warm, moist climates. Fleas live by sucking blood from their hosts. Eggs are laid on the host or in
carpet, bedding materials and the yard. They hatch into maggot-like larvae,
which feed on flea dirt, which is the fecal material of live fleas, made up
primarily of blood, and other debris in the area. The female flea can lay
hundreds of eggs in her lifetime, which is why fleas seem to multiply before
your eyes. The flea larvae form a cocoon, pupate, and then hatch into adults.
This whole cycle takes as little as 3 weeks, but can last almost 2 years; it
will proceed fastest in the warm and humid summer months. The bite of the flea alone is quite itchy, but in some dogs, a severe,
intense allergic reaction to flea saliva, known as Flea Allergic Dermatitis
can occur. These dogs have hair loss, extreme itching, and secondary infections
of the skin. Fleas may be identified by seeing 1-2mm black/brown specks racing
(they move very fast) across the back, groin and hindleg areas of the dog. Tiny
sand-sized black specks may be present in the fur, called flea dirt, which if
wetted, will turn red, as this is digested blood-droppings of the flea. Tiny
white specks may also be seen on the fur, these being the flea eggs. CONTROL OF FLEA INFESTATION At any given time, only 1% of the flea population exists in the adult stage;
the other 99% are eggs, larvae and pupae just waiting to become adults and
infest your dog. Understanding this fact is essential to winning the war against
fleas; simply spraying or dipping the dog will seldom do more than destroy a
tiny fraction of your local flea army. There is no one-plan-fits-all strategy,
but in short, killing and repelling fleas on the dog, as well as destroying and
removing the eggs and larvae from the house and yard are essential parts of any
strategy. It is best to work with your veterinarian to select safe and effective
products. There are hundreds if not thousands of products sold today, many that
are unproven and unsafe. Your veterinarian will generally have the latest
improvements and safest agents available. Avoid untrained pet store personnel
who have little training in chemistry and parasite control. Most are simply
trying to sell you a product, not treat your pet in the best possible manner. TOPICAL REPELLANTS such as Frontlinetm and Advantagetm,
are applied to the skin of the dog or cat where they spread out and over the
entire skin area. These provide a sort of total body flea collar and are very
effective in killing and repelling fleas. These agents have minimal toxicity
for most pets: side effects are very rare. This is considered the "state of
the art" in flea and tick control today. Avoid "knock off"
products. We have seen poor performance and some severe toxic reactions from
many off-brand chemicals sold in pet and retail stores. DIPS provide quick and effective flea kill and can usually be mixed
from a concentrate and poured or sponged onto your dog. You must dip about every
two weeks as the dip will weaken in about that time. Do not rinse off the dip to
provide residual anti-flea activity. We have had great success with Paramite
dip. TOPICAL SPRAYS work well to quickly kill fleas, and a few will provide
residual protection or prevent eggs from hatching out later. Sprays can be used
between dipping, and in conjunction with topical and systemic medications.
Alcohol-based sprays work best, but some people and dogs may be bothered by the
fumes, so less effective water-based treatments are also available. Please ask
as to what sprays are currently available. POWDERS are usually safe and inexpensive, but are slow to kill, and you
must powder your dog every few days to maintain their effectiveness. Powders
also do little more than kill adult fleas only. SHAMPOOS also kill adult fleas, and assist in cleaning eggs and dirt from
the coat, but have minimal residual activity or effectiveness against pre-adult
fleas. Using shampoo then dipping or using a spray is the best strategy. FLEA COLLARS, if they are high quality, can help kill and repel fleas,
but have been pretty well replaced by topical products mentioned above. Poor
quality collars can be toxic to you dog, and can irritate the skin on the neck
of your pet, so avoid the grocery store brands. SYSTEMIC AGENTS like Programtm, the trade name for the drug
lufenuron, is an oral systemic which is completely non-toxic to the pet, and
when ingested as the flea sucks blood, renders her eggs incapable of producing
adult fleas. This does nothing to kill adult fleas and other products will still
be needed. Programtm will, however, cut the flea problem down at its
very roots and is highly recommended. It is considered safe in conjunction with
sprays, and other topical agents. FOGGERS and SPRAYS for the house and yard are useful in controlling the
balance of your flea population. Newer foggers have time-release agents
providing kill for weeks after application. Many contain growth regulators to
inhibit the hatching of eggs already in the environment. Foggers also apply
their chemicals EVERYWHERE which happens to be where the fleas live, so these
can be very useful in getting a bad flea problem quickly under control. Many
sprays work in similar fashion but are better suited for direct application to
baseboards and bedding areas where the heaviest infestations occur. Vacuuming the carpets, or better, using a carpet cleaning machine before
spraying or fogging works well to remove eggs, larvae and pupae, as well as the
dirt on which the larvae feed. Be certain to dispose of vacuum bags far from the
house as live fleas can crawl out and find their way back home. Spaying the yard; grass, fences, patios and dirt areas with a yard spray made
for fleas is also important to get flea problems under control. Spraying may be
needed every 7-10 days in warmer weather, and you can do it yourself or hire
professional exterminators to do the job for you. Be careful to keep your dogs
away from freshly sprayed areas until they are dry.
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©2007 James W. Day D.V.M., P.C.